restconf/sal-rest-connector/src/main/java/org/opendaylight/restconf/jersey/providers/JsonToPatchBodyReader.java

   1 /*
   2  * Copyright (c) 2016 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.restconf.jersey.providers;
  10
  11 import static org.opendaylight.netconf.sal.restconf.impl.PatchEditOperation.isPatchOperationWithValue;
  12
  13 import com.google.common.collect.ImmutableList;
  14 import com.google.gson.stream.JsonReader;
  15 import com.google.gson.stream.JsonToken;
  16 import java.io.IOException;
  17 import java.io.InputStream;
  18 import java.io.InputStreamReader;
  19 import java.io.StringReader;
  20 import java.lang.annotation.Annotation;
  21 import java.lang.reflect.Type;
  22 import java.util.ArrayList;
  23 import java.util.List;
  24 import javax.annotation.Nonnull;
  25 import javax.ws.rs.Consumes;
  26 import javax.ws.rs.WebApplicationException;
  27 import javax.ws.rs.core.MediaType;
  28 import javax.ws.rs.core.MultivaluedMap;
  29 import javax.ws.rs.ext.MessageBodyReader;
  30 import javax.ws.rs.ext.Provider;
  31 import org.opendaylight.netconf.sal.restconf.impl.ControllerContext;
  32 import org.opendaylight.netconf.sal.restconf.impl.InstanceIdentifierContext;
  33 import org.opendaylight.netconf.sal.restconf.impl.PatchContext;
  34 import org.opendaylight.netconf.sal.restconf.impl.PatchEntity;
  35 import org.opendaylight.netconf.sal.restconf.impl.RestconfDocumentedException;
  36 import org.opendaylight.netconf.sal.restconf.impl.RestconfError.ErrorTag;
  37 import org.opendaylight.netconf.sal.restconf.impl.RestconfError.ErrorType;
  38 import org.opendaylight.restconf.Rfc8040;
  39 import org.opendaylight.restconf.utils.RestconfConstants;
  40 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  41 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
  42 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  43 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  44 import org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream;
  45 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
  46 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
  47 import org.opendaylight.yangtools.yang.data.impl.schema.ResultAlreadySetException;
  48 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
  49 import org.opendaylight.yangtools.yang.model.util.SchemaContextUtil;
  50 import org.slf4j.Logger;
  51 import org.slf4j.LoggerFactory;
  52
  53 @Provider
  54 @Consumes({Rfc8040.MediaTypes.PATCH + RestconfConstants.JSON})
  55 public class JsonToPatchBodyReader extends AbstractIdentifierAwareJaxRsProvider
  56         implements MessageBodyReader<PatchContext> {
  57
  58     private static final Logger LOG = LoggerFactory.getLogger(JsonToPatchBodyReader.class);
  59     private String patchId;
  60
  61     @Override
  62     public boolean isReadable(final Class<?> type, final Type genericType,
  63                               final Annotation[] annotations, final MediaType mediaType) {
  64         return true;
  65     }
  66
  67     @SuppressWarnings("checkstyle:IllegalCatch")
  68     @Override
  69     public PatchContext readFrom(final Class<PatchContext> type, final Type genericType,
  70                                  final Annotation[] annotations, final MediaType mediaType,
  71                                  final MultivaluedMap<String, String> httpHeaders, final InputStream entityStream)
  72             throws IOException, WebApplicationException {
  73         try {
  74             return readFrom(getInstanceIdentifierContext(), entityStream);
  75         } catch (final Exception e) {
  76             throw propagateExceptionAs(e);
  77         }
  78     }
  79
  80     private PatchContext readFrom(final InstanceIdentifierContext<?> path, final InputStream entityStream)
  81             throws IOException {
  82         if (entityStream.available() < 1) {
  83             return new PatchContext(path, null, null);
  84         }
  85
  86         final JsonReader jsonReader = new JsonReader(new InputStreamReader(entityStream));
  87         final List<PatchEntity> resultList = read(jsonReader, path);
  88         jsonReader.close();
  89
  90         return new PatchContext(path, resultList, patchId);
  91     }
  92
  93     @SuppressWarnings("checkstyle:IllegalCatch")
  94     public PatchContext readFrom(final String uriPath, final InputStream entityStream) throws
  95             RestconfDocumentedException {
  96         try {
  97             return readFrom(ControllerContext.getInstance().toInstanceIdentifier(uriPath), entityStream);
  98         } catch (final Exception e) {
  99             propagateExceptionAs(e);
 100             return null; // no-op
 101         }
 102     }
 103
 104     private static RuntimeException propagateExceptionAs(final Exception exception) throws RestconfDocumentedException {
 105         if (exception instanceof RestconfDocumentedException) {
 106             throw (RestconfDocumentedException)exception;
 107         }
 108
 109         if (exception instanceof ResultAlreadySetException) {
 110             LOG.debug("Error parsing json input:", exception);
 111             throw new RestconfDocumentedException("Error parsing json input: Failed to create new parse result data. ");
 112         }
 113
 114         throw new RestconfDocumentedException("Error parsing json input: " + exception.getMessage(), ErrorType.PROTOCOL,
 115                 ErrorTag.MALFORMED_MESSAGE, exception);
 116     }
 117
 118     private List<PatchEntity> read(final JsonReader in, final InstanceIdentifierContext<?> path) throws IOException {
 119         final List<PatchEntity> resultCollection = new ArrayList<>();
 120         final StringModuleInstanceIdentifierCodec codec = new StringModuleInstanceIdentifierCodec(
 121                 path.getSchemaContext());
 122         final JsonToPatchBodyReader.PatchEdit edit = new JsonToPatchBodyReader.PatchEdit();
 123
 124         while (in.hasNext()) {
 125             switch (in.peek()) {
 126                 case STRING:
 127                 case NUMBER:
 128                     in.nextString();
 129                     break;
 130                 case BOOLEAN:
 131                     Boolean.toString(in.nextBoolean());
 132                     break;
 133                 case NULL:
 134                     in.nextNull();
 135                     break;
 136                 case BEGIN_ARRAY:
 137                     in.beginArray();
 138                     break;
 139                 case BEGIN_OBJECT:
 140                     in.beginObject();
 141                     break;
 142                 case END_DOCUMENT:
 143                     break;
 144                 case NAME:
 145                     parseByName(in.nextName(), edit, in, path, codec, resultCollection);
 146                     break;
 147                 case END_OBJECT:
 148                     in.endObject();
 149                     break;
 150                 case END_ARRAY:
 151                     in.endArray();
 152                     break;
 153
 154                 default:
 155                     break;
 156             }
 157         }
 158
 159         return ImmutableList.copyOf(resultCollection);
 160     }
 161
 162     /**
 163      * Switch value of parsed JsonToken.NAME and read edit definition or patch id.
 164      *
 165      * @param name value of token
 166      * @param edit PatchEdit instance
 167      * @param in JsonReader reader
 168      * @param path InstanceIdentifierContext context
 169      * @param codec Draft11StringModuleInstanceIdentifierCodec codec
 170      * @param resultCollection collection of parsed edits
 171      * @throws IOException if operation fails
 172      */
 173     private void parseByName(@Nonnull final String name, @Nonnull final PatchEdit edit,
 174                              @Nonnull final JsonReader in, @Nonnull final InstanceIdentifierContext<?> path,
 175                              @Nonnull final StringModuleInstanceIdentifierCodec codec,
 176                              @Nonnull final List<PatchEntity> resultCollection) throws IOException {
 177         switch (name) {
 178             case "edit" :
 179                 if (in.peek() == JsonToken.BEGIN_ARRAY) {
 180                     in.beginArray();
 181
 182                     while (in.hasNext()) {
 183                         readEditDefinition(edit, in, path, codec);
 184                         resultCollection.add(prepareEditOperation(edit));
 185                         edit.clear();
 186                     }
 187
 188                     in.endArray();
 189                 } else {
 190                     readEditDefinition(edit, in, path, codec);
 191                     resultCollection.add(prepareEditOperation(edit));
 192                     edit.clear();
 193                 }
 194
 195                 break;
 196             case "patch-id" :
 197                 this.patchId = in.nextString();
 198                 break;
 199             default:
 200                 break;
 201         }
 202     }
 203
 204     /**
 205      * Read one patch edit object from Json input.
 206      *
 207      * @param edit PatchEdit instance to be filled with read data
 208      * @param in JsonReader reader
 209      * @param path InstanceIdentifierContext path context
 210      * @param codec Draft11StringModuleInstanceIdentifierCodec codec
 211      * @throws IOException if operation fails
 212      */
 213     private void readEditDefinition(@Nonnull final PatchEdit edit, @Nonnull final JsonReader in,
 214                                     @Nonnull final InstanceIdentifierContext<?> path,
 215                                     @Nonnull final StringModuleInstanceIdentifierCodec codec) throws IOException {
 216         final StringBuffer value = new StringBuffer();
 217         in.beginObject();
 218
 219         while (in.hasNext()) {
 220             final String editDefinition = in.nextName();
 221             switch (editDefinition) {
 222                 case "edit-id" :
 223                     edit.setId(in.nextString());
 224                     break;
 225                 case "operation" :
 226                     edit.setOperation(in.nextString());
 227                     break;
 228                 case "target" :
 229                     // target can be specified completely in request URI
 230                     final String target = in.nextString();
 231                     if (target.equals("/")) {
 232                         edit.setTarget(path.getInstanceIdentifier());
 233                         edit.setTargetSchemaNode(path.getSchemaContext());
 234                     } else {
 235                         edit.setTarget(codec.deserialize(codec.serialize(path.getInstanceIdentifier()).concat(target)));
 236                         edit.setTargetSchemaNode(SchemaContextUtil.findDataSchemaNode(path.getSchemaContext(),
 237                                 codec.getDataContextTree().getChild(edit.getTarget()).getDataSchemaNode().getPath()
 238                                         .getParent()));
 239                     }
 240
 241                     break;
 242                 case "value" :
 243                     // save data defined in value node for next (later) processing, because target needs to be read
 244                     // always first and there is no ordering in Json input
 245                     readValueNode(value, in);
 246                     break;
 247                 default:
 248                     break;
 249             }
 250         }
 251
 252         in.endObject();
 253
 254         // read saved data to normalized node when target schema is already known
 255         edit.setData(
 256                 readEditData(new JsonReader(new StringReader(value.toString())), edit.getTargetSchemaNode(), path));
 257     }
 258
 259     /**
 260      * Parse data defined in value node and saves it to buffer.
 261      * @param value Buffer to read value node
 262      * @param in JsonReader reader
 263      * @throws IOException if operation fails
 264      */
 265     private void readValueNode(@Nonnull final StringBuffer value, @Nonnull final JsonReader in) throws IOException {
 266         in.beginObject();
 267         value.append("{");
 268
 269         value.append("\"" + in.nextName() + "\"" + ":");
 270
 271         if (in.peek() == JsonToken.BEGIN_ARRAY) {
 272             in.beginArray();
 273             value.append("[");
 274
 275             while (in.hasNext()) {
 276                 if (in.peek() == JsonToken.STRING) {
 277                     value.append("\"" + in.nextString() + "\"");
 278                 } else {
 279                     readValueObject(value, in);
 280                 }
 281                 if (in.peek() != JsonToken.END_ARRAY) {
 282                     value.append(",");
 283                 }
 284             }
 285
 286             in.endArray();
 287             value.append("]");
 288         } else {
 289             readValueObject(value, in);
 290         }
 291
 292         in.endObject();
 293         value.append("}");
 294     }
 295
 296     /**
 297      * Parse one value object of data and saves it to buffer.
 298      * @param value Buffer to read value object
 299      * @param in JsonReader reader
 300      * @throws IOException if operation fails
 301      */
 302     private void readValueObject(@Nonnull final StringBuffer value, @Nonnull final JsonReader in) throws IOException {
 303         // read simple leaf value
 304         if (in.peek() == JsonToken.STRING) {
 305             value.append("\"" + in.nextString() + "\"");
 306             return;
 307         }
 308
 309         in.beginObject();
 310         value.append("{");
 311
 312         while (in.hasNext()) {
 313             value.append("\"" + in.nextName() + "\"");
 314             value.append(":");
 315
 316             if (in.peek() == JsonToken.STRING) {
 317                 value.append("\"" + in.nextString() + "\"");
 318             } else {
 319                 if (in.peek() == JsonToken.BEGIN_ARRAY) {
 320                     in.beginArray();
 321                     value.append("[");
 322
 323                     while (in.hasNext()) {
 324                         if (in.peek() == JsonToken.STRING) {
 325                             value.append("\"" + in.nextString() + "\"");
 326                         } else {
 327                             readValueObject(value, in);
 328                         }
 329                         if (in.peek() != JsonToken.END_ARRAY) {
 330                             value.append(",");
 331                         }
 332                     }
 333
 334                     in.endArray();
 335                     value.append("]");
 336                 } else {
 337                     readValueObject(value, in);
 338                 }
 339             }
 340
 341             if (in.peek() != JsonToken.END_OBJECT) {
 342                 value.append(",");
 343             }
 344         }
 345
 346         in.endObject();
 347         value.append("}");
 348     }
 349
 350     /**
 351      * Read patch edit data defined in value node to NormalizedNode.
 352      * @param in reader JsonReader reader
 353      * @return NormalizedNode representing data
 354      */
 355     private static NormalizedNode<?, ?> readEditData(@Nonnull final JsonReader in,
 356             @Nonnull final SchemaNode targetSchemaNode, @Nonnull final InstanceIdentifierContext<?> path) {
 357         final NormalizedNodeResult resultHolder = new NormalizedNodeResult();
 358         final NormalizedNodeStreamWriter writer = ImmutableNormalizedNodeStreamWriter.from(resultHolder);
 359         JsonParserStream.create(writer, path.getSchemaContext(), targetSchemaNode).parse(in);
 360
 361         return resultHolder.getResult();
 362     }
 363
 364     /**
 365      * Prepare PatchEntity from PatchEdit instance when it satisfies conditions, otherwise throws exception.
 366      * @param edit Instance of PatchEdit
 367      * @return PatchEntity Patch entity
 368      */
 369     private static PatchEntity prepareEditOperation(@Nonnull final PatchEdit edit) {
 370         if (edit.getOperation() != null && edit.getTargetSchemaNode() != null
 371                 && checkDataPresence(edit.getOperation(), edit.getData() != null)) {
 372             if (!isPatchOperationWithValue(edit.getOperation())) {
 373                 return new PatchEntity(edit.getId(), edit.getOperation(), edit.getTarget());
 374             }
 375
 376             // for lists allow to manipulate with list items through their parent
 377             final YangInstanceIdentifier targetNode;
 378             if (edit.getTarget().getLastPathArgument() instanceof NodeIdentifierWithPredicates) {
 379                 targetNode = edit.getTarget().getParent();
 380             } else {
 381                 targetNode = edit.getTarget();
 382             }
 383
 384             return new PatchEntity(edit.getId(), edit.getOperation(), targetNode, edit.getData());
 385         }
 386
 387         throw new RestconfDocumentedException("Error parsing input", ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
 388     }
 389
 390     /**
 391      * Check if data is present when operation requires it and not present when operation data is not allowed.
 392      * @param operation Name of operation
 393      * @param hasData Data in edit are present/not present
 394      * @return true if data is present when operation requires it or if there are no data when operation does not
 395      *     allow it, false otherwise
 396      */
 397     private static boolean checkDataPresence(@Nonnull final String operation, final boolean hasData) {
 398         return isPatchOperationWithValue(operation) == hasData;
 399     }
 400
 401     /**
 402      * Helper class representing one patch edit.
 403      */
 404     private static final class PatchEdit {
 405         private String id;
 406         private String operation;
 407         private YangInstanceIdentifier target;
 408         private SchemaNode targetSchemaNode;
 409         private NormalizedNode<?, ?> data;
 410
 411         public String getId() {
 412             return id;
 413         }
 414
 415         public void setId(final String id) {
 416             this.id = id;
 417         }
 418
 419         public String getOperation() {
 420             return operation;
 421         }
 422
 423         public void setOperation(final String operation) {
 424             this.operation = operation;
 425         }
 426
 427         public YangInstanceIdentifier getTarget() {
 428             return target;
 429         }
 430
 431         public void setTarget(final YangInstanceIdentifier target) {
 432             this.target = target;
 433         }
 434
 435         public SchemaNode getTargetSchemaNode() {
 436             return targetSchemaNode;
 437         }
 438
 439         public void setTargetSchemaNode(final SchemaNode targetSchemaNode) {
 440             this.targetSchemaNode = targetSchemaNode;
 441         }
 442
 443         public NormalizedNode<?, ?> getData() {
 444             return data;
 445         }
 446
 447         public void setData(final NormalizedNode<?, ?> data) {
 448             this.data = data;
 449         }
 450
 451         public void clear() {
 452             id = null;
 453             operation = null;
 454             target = null;
 455             targetSchemaNode = null;
 456             data = null;
 457         }
 458     }
 459 }